3965909 has 4 divisors (see below), whose sum is σ = 3974016. Its totient is φ = 3957804.

The previous prime is 3965903. The next prime is 3965911. The reversal of 3965909 is 9095693.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9095693 = 199 ⋅45707.

It is a cyclic number.

It is not a de Polignac number, because 3965909 - 2⁸ = 3965653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3965903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3269 + ... + 4314.

It is an arithmetic number, because the mean of its divisors is an integer number (993504).

Almost surely, 2^3965909 is an apocalyptic number.

It is an amenable number.

3965909 is a deficient number, since it is larger than the sum of its proper divisors (8107).

3965909 is an equidigital number, since it uses as much as digits as its factorization.

3965909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 3965909 is about 1991.4590128848. The cubic root of 3965909 is about 158.2878505247.

The spelling of 3965909 in words is "three million, nine hundred sixty-five thousand, nine hundred nine".